﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO.Ports;
using System.Text.RegularExpressions;


namespace JBus_communication
{
    /*使用時 位址請輸入16進位字串 要讀幾個word是10進位字串 要寫入的字串也是10進位 */
    class JBus
    {
        #region CRCtable
        ushort[] CRC16Table = new ushort[]{ 0x0000, 0xC0C1, 0xC181, 0x0140, 0xC301, 0x03C0, 0x0280, 0xC241,   
                                            0xC601, 0x06C0, 0x0780, 0xC741, 0x0500, 0xC5C1, 0xC481, 0x0440,   
                                            0xCC01, 0x0CC0, 0x0D80, 0xCD41, 0x0F00, 0xCFC1, 0xCE81, 0x0E40,   
                                            0x0A00, 0xCAC1, 0xCB81, 0x0B40, 0xC901, 0x09C0, 0x0880, 0xC841,   
                                            0xD801, 0x18C0, 0x1980, 0xD941, 0x1B00, 0xDBC1, 0xDA81, 0x1A40,   
                                            0x1E00, 0xDEC1, 0xDF81, 0x1F40, 0xDD01, 0x1DC0, 0x1C80, 0xDC41,   
                                            0x1400, 0xD4C1, 0xD581, 0x1540, 0xD701, 0x17C0, 0x1680, 0xD641,   
                                            0xD201, 0x12C0, 0x1380, 0xD341, 0x1100, 0xD1C1, 0xD081, 0x1040,   
                                            0xF001, 0x30C0, 0x3180, 0xF141, 0x3300, 0xF3C1, 0xF281, 0x3240,   
                                            0x3600, 0xF6C1, 0xF781, 0x3740, 0xF501, 0x35C0, 0x3480, 0xF441,   
                                            0x3C00, 0xFCC1, 0xFD81, 0x3D40, 0xFF01, 0x3FC0, 0x3E80, 0xFE41,   
                                            0xFA01, 0x3AC0, 0x3B80, 0xFB41, 0x3900, 0xF9C1, 0xF881, 0x3840,   
                                            0x2800, 0xE8C1, 0xE981, 0x2940, 0xEB01, 0x2BC0, 0x2A80, 0xEA41,   
                                            0xEE01, 0x2EC0, 0x2F80, 0xEF41, 0x2D00, 0xEDC1, 0xEC81, 0x2C40,   
                                            0xE401, 0x24C0, 0x2580, 0xE541, 0x2700, 0xE7C1, 0xE681, 0x2640,   
                                            0x2200, 0xE2C1, 0xE381, 0x2340, 0xE101, 0x21C0, 0x2080, 0xE041,   
                                            0xA001, 0x60C0, 0x6180, 0xA141, 0x6300, 0xA3C1, 0xA281, 0x6240,   
                                            0x6600, 0xA6C1, 0xA781, 0x6740, 0xA501, 0x65C0, 0x6480, 0xA441,   
                                            0x6C00, 0xACC1, 0xAD81, 0x6D40, 0xAF01, 0x6FC0, 0x6E80, 0xAE41,   
                                            0xAA01, 0x6AC0, 0x6B80, 0xAB41, 0x6900, 0xA9C1, 0xA881, 0x6840,   
                                            0x7800, 0xB8C1, 0xB981, 0x7940, 0xBB01, 0x7BC0, 0x7A80, 0xBA41,   
                                            0xBE01, 0x7EC0, 0x7F80, 0xBF41, 0x7D00, 0xBDC1, 0xBC81, 0x7C40,   
                                            0xB401, 0x74C0, 0x7580, 0xB541, 0x7700, 0xB7C1, 0xB681, 0x7640,   
                                            0x7200, 0xB2C1, 0xB381, 0x7340, 0xB101, 0x71C0, 0x7080, 0xB041,   
                                            0x5000, 0x90C1, 0x9181, 0x5140, 0x9301, 0x53C0, 0x5280, 0x9241,   
                                            0x9601, 0x56C0, 0x5780, 0x9741, 0x5500, 0x95C1, 0x9481, 0x5440,   
                                            0x9C01, 0x5CC0, 0x5D80, 0x9D41, 0x5F00, 0x9FC1, 0x9E81, 0x5E40,   
                                            0x5A00, 0x9AC1, 0x9B81, 0x5B40, 0x9901, 0x59C0, 0x5880, 0x9841,   
                                            0x8801, 0x48C0, 0x4980, 0x8941, 0x4B00, 0x8BC1, 0x8A81, 0x4A40,   
                                            0x4E00, 0x8EC1, 0x8F81, 0x4F40, 0x8D01, 0x4DC0, 0x4C80, 0x8C41,   
                                            0x4400, 0x84C1, 0x8581, 0x4540, 0x8701, 0x47C0, 0x4680, 0x8641,   
                                            0x8201, 0x42C0, 0x4380, 0x8341, 0x4100, 0x81C1, 0x8081, 0x4040 };
        #endregion

        public SerialPort port { get; set; }
        public byte slaveNum { get; set; }
        public byte[] readData { get; set; }
        public short writeData { get; set; }

        private byte[] command = new byte[8];
        private const UInt16 ADDRESS_MAX = 0xE33F;
        private const UInt16 ADDRESS_MIN = 0xE000;
        public UInt16 readAddress;
        public UInt16 writeAddress;

        public JBus(byte slaveNum, SerialPort port)
        {
            this.slaveNum = slaveNum;
            this.port = port;
        }

        //利用JBus讀取 回傳0:正常 -1:不正常
        public int ReadThroughJBus(ushort uAddress, byte uRd2ReadByWord)
        {
            //if (uAddress > ADDRESS_MAX || uAddress < ADDRESS_MIN)
            //{
            //    Console.WriteLine("the readAddress is over Address map");
            //    return -1;
            //}

            command[0] = this.slaveNum;
            command[1] = 0x03;
            command[2] = (byte)(uAddress >> 8);
            command[3] = (byte)(uAddress % 256);
            command[4] = 0;
            command[5] = (byte)uRd2ReadByWord;

            byte[] commandCRC = CalCRC(command);
            command[6] = commandCRC[0];
            command[7] = commandCRC[1];

            this.port.Write(command, 0, 8);//傳讀取命令給JBus
            System.Threading.Thread.Sleep(50); //睡一下

            if (this.port.BytesToRead == 0)
            {
                Console.WriteLine("no response");
                return -1;
            }

            byte[] readResponse = new byte[this.port.BytesToRead];
            this.port.Read(readResponse, 0, this.port.BytesToRead);

            //判斷回來資料長度正不正確 正確的話再驗證CRC 
            if (readResponse.Length == uRd2ReadByWord * 2 + 5)
            {
                byte[] responseCRC = CalCRC(readResponse);

                if ((responseCRC[0] != readResponse[readResponse.Length - 2]
                    | responseCRC[1] != readResponse[readResponse.Length - 1]))
                {
                    Console.WriteLine("crc verify is fault?");
                    return -1;
                }
            }
            else
            {
                return -1;
            }

            this.readData = new byte[readResponse[2]];

            //把其他不需要的資訊過濾掉
            for (int i = 3; i < readResponse.Length - 2; i++)
            {
                this.readData[i - 3] = readResponse[i];
            }
            //等資料都抓完後再把下一筆要抓的位址存在this.readAddress裡
            this.readAddress = uAddress;
            return 0;
        }

        //利用JBus寫入 回傳0:正常 -1:不正常 
        public int WriteThroughJBus(ushort uAddress, short uWriteData)
        {
            //if (uAddress > ADDRESS_MAX || uAddress < ADDRESS_MIN)
            //{
            //    Console.WriteLine("the readAddress is over Address map");
            //    return -1;
            //}

            command[0] = this.slaveNum;
            command[1] = 0x06;
            command[2] = (byte)(uAddress >> 8);
            command[3] = (byte)(uAddress % 256);
            command[4] = (byte)(uWriteData >> 8);
            command[5] = (byte)(uWriteData % 256);

            byte[] commandCRC = CalCRC(command);
            command[6] = commandCRC[0];
            command[7] = commandCRC[1];

            this.port.Write(command, 0, 8);//傳讀取命令給JBus
            System.Threading.Thread.Sleep(50); //睡一下

            if (this.port.BytesToRead == 0)
            {
                Console.WriteLine("no response");
                return -1;
            }

            byte[] writeResponse = new byte[this.port.BytesToRead];
            this.port.Read(writeResponse, 0, this.port.BytesToRead);

            //判斷回來資料長度正不正確 正確的話再驗證CRC
            if (writeResponse.Length == 8)
            {
                byte[] responseCRC = CalCRC(writeResponse);

                if ((responseCRC[0] != writeResponse[writeResponse.Length - 2]
                    | responseCRC[1] != writeResponse[writeResponse.Length - 1]))
                {
                    Console.WriteLine("crc verify is fault?");
                    return -1;
                }
            }
            else
            {
                return -1;
            }

            this.writeAddress = uAddress;
            this.writeData = uWriteData;
            return 0;
        }

        public byte[] CalCRC(byte[] msg2)
        {
            byte CRC_HI = 0xff;
            byte CRC_LOW = 0xff;
            int CRCIndex = 0;
            for (int i = 0; i < msg2.Length - 2; i++)
            {
                CRCIndex = CRC_LOW ^ msg2[i];
                CRC_LOW = Convert.ToByte(CRC_HI ^ (CRC16Table[CRCIndex] & 0x00ff));  //與table 的low byte 做處理 
                CRC_HI = Convert.ToByte((CRC16Table[CRCIndex] & 0xff00) >> 8);       //與table 的hi byte 做處理
            }
            return (new byte[] { CRC_LOW, CRC_HI });
        }

    }// end JBus
}
